txn: remove useless code for pessimistic lock cache

[ekexium]

What problem does this PR solve?

Issue Number: ref #43294

Problem Summary:

What is changed and how it works?

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)
• No code

Side effects

• Performance regression: Consumes more CPU
• Performance regression: Consumes more Memory
• Breaking backward compatibility

Documentation

• Affects user behaviors
• Contains syntax changes
• Contains variable changes
• Contains experimental features
• Changes MySQL compatibility

Release note

Please refer to Release Notes Language Style Guide to write a quality release note.

None

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• crazycs520

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[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: crazycs520, you06

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2023-07-06 13:38:16.731869831 +0000 UTC m=+28775.613345779: ☑️ agreed by you06.

[zimulala]

@ekexium

2023-07-06 13:38:16.731869831 +0000 UTC m=+28775.613345779: ☑️ agreed by you06.

I think it's the bot. Maybe you need another LGTM here.

[ekexium]

/retest

[tiprow]

@ekexium: Cannot trigger testing until a trusted user reviews the PR and leaves an /ok-to-test message.

In response to this:

/retest

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[ti-chi-bot]

PR needs rebase.

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[codecov]

Codecov Report

Merging #43803 (c7a8cde) into master (50b6987) will decrease coverage by 0.0143%.
Report is 1884 commits behind head on master.
The diff coverage is n/a.

Additional details and impacted files

@@               Coverage Diff                @@
##             master     #43803        +/-   ##
================================================
- Coverage   73.4481%   73.4339%   -0.0143%     
================================================
  Files          1196       1196                
  Lines        374882     374880         -2     
================================================
- Hits         275344     275289        -55     
- Misses        81886      81939        +53     
  Partials      17652      17652                

[ti-chi-bot]

@ekexium: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
idc-jenkins-ci-tidb/build	c7a8cde	link	true	/test build
idc-jenkins-ci-tidb/check_dev	c7a8cde	link	true	/test check-dev
idc-jenkins-ci-tidb/check_dev_2	c7a8cde	link	true	/test check-dev2
idc-jenkins-ci-tidb/mysql-test	c7a8cde	link	true	/test mysql-test
idc-jenkins-ci-tidb/unit-test	c7a8cde	link	true	/test unit-test
pull-integration-ddl-test	c7a8cde	link	true	/test pull-integration-ddl-test
pull-mysql-client-test	c7a8cde	link	true	/test pull-mysql-client-test
pull-br-integration-test	c7a8cde	link	true	/test pull-br-integration-test
pull-lightning-integration-test	c7a8cde	link	true	/test pull-lightning-integration-test

Full PR test history. Your PR dashboard.

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